Locking device for gas-stoves.



F. C. OELKERS.

LOCKING DEVICE FOR GAS STOVES. APPLICATION FILED DEC. 8. I914.

1217.209. e Patented Feb. 27,1917.

X 5; a kc awuwvto c n WC M I v a T in: STATES ATENT FREDERICK c. oELKERs, OF EAST PORT CHESTER, NEW YoRK, AssreNoR T0 GENERAJ: GAS APPLIANCE COMPANY, or NEW YoRK, N. Y., A coRPoRA'rIoN OF NEW JERSEY LocKI G DEVICEFOR GAS-STOVES.

Specification of Letters Patent.

Patented Feb. 27, 1917.

Application filed December 8, 1914. Serial No.'876,018.

To all whom it may concern: 7

Be it known that I, FREDERICK C. Ont.-

KEns, a citizen of the United States, resid- My invention relates to that class of gas.

stoves or ranges provided with two burners, the one located below and the other above or in the upper part of the oven. In such stoves as heretofore constructed the valves controlling the supply of gas burners have been independently operable so that when the gas was ignited at one of the burners and was afterward accidentally turned on to the other there would be an accumulation of gas in the ovenwith consequent explosion due to the ignition of the accumulated gas.

The object of my improvement is to prevent this by providing means for the automatic locking of one of the gas valves whenever the other is opened so that the admission of gas to bothburners at the same time is made impossible, This I accomplish by means of the device hereinafter described and set forth in the accompanying claims.

My invention will be best understood by reference to the accompanying drawings illustrating an embodiment thereof, Figure 1 of which shows a partial side elevation of a stove with the locking device applied thereto; Fig. 2 shows a partial sectional view on the line 22 Fig. 1; Fig. 3 is a partial front view of the stove; Figs. 4 and 5 are partial perspective views of parts of I the'locking device.

Referring to the drawings, A, indicates a gas stove provided with upper and lower burners (not shown in the drawings) to which gas is supplied by gas pipes B, B which are controlled by the usual valves C, C operable by valve stems D, D which lie one above the other in the same vertical lane.

Each of the valve stems is provided with a. projecting lug, or cam, (1, d secured to "means actuated by or forming a part thereof. v

Between the valvestems, D, D is located a -vertically movable member, E, orovided with projecting shoulders, e, 6 which are so located as to be, the one directly below the upper, and" the other directly above the lower, of the lugs or cams, cl, 4 Small spurs or projections f, f are provided which, when the valve stems are turned to open the valves, lie in front of. the member E and prevent any forward movement of the member E. Normally, when the'valves C, C are closed the lugs, d, (1 project in a horizontal direction. When, however, one of the valves as,-C, is opened the lug, d, is, by the-turning of the valve stem, I), turned downward thus bringing it against the shoulder, c, and pushing the movable memher, E, downward. The shoulder, e is thus brought and held against the lug, 6Z2,

thereby preventing the turning of the valve stem, D and consequently the opening of the valve, C. When the valve, C is opened the operation is reversed, the member, E, being lifted and the shoulder, 6, being.

brought and held against the horizontally disposed lug, d, thus preventing the turning of the valve stem- D and the opening of the valve, C. I

In this manner the opening of either valve when the other is open is made impossible and all danger of explosion from this source is obviated.

What I claim as new and desire to secure by Letters Patent is 1. The combination with a gas range having two burners of a valve for each burner and means whereby only one valve can be turned on at one time. I I

2. The combination with a gas range having an upper and a lower burner, of a valve controlling the flow of gas to each burner and provided with valve stems, a projecting lugon'each of the valve stems, and a vertically movable member provided with projections adaptedto make'contact with said lugs when the valves are opened whereby when one valve is opened the other valve is prevented from being opened.

3. In a gas range having upper and lower burners, the combination of valves for controlling the fiow of gas to the burners, means for. opening and closing the valves, a member adapted to be moved by the movement of the valve opening mechanism and the movement of said member to hold one of the valves closed while the other yalve is open.

4. In a safety attachment for gas ranges, the combination with a main supply pipe,

. a pair of spaced branch supply pipes Q tar/320a thereon, valves in said branch pipes, of parallel operating handles having bifurcated ends adapted for engagement with said valves, bearings in which the opposite ends of said handles are mounted, lugs projecting from the sides of said handles at opposite points and disposed in parallel relation when the valves are closed, and a locking strip slidably mounted between said han- 10 dles having out-turned shoulders adapted for engagement with the lugs to prevent both valves being open at the same time.

In testimony whereof, I have hereunto subscribed my name, this 7th day of December A. 1)., 1914.

FREDERICK C. OELKERS.

Witnesses:

C. S. HAMMELL, CLARKSON A. COLLINS. 

